TCNQ-derived N/S dual-doped carbon cube electrocatalysts with built-in CoS2 nanoparticles for high-rate lithium-oxygen batteries

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 418; p. 129367
• Main Authors: Seon Kim, Yoon, Lee, Gwang-Hee, Ju, Bobae, Kim, Dong-Wan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.2021
• Subjects: CoS2; Electrocatalysts; Fast charge; Lithium-oxygen battery; Nitrogen/sulfur dual-doped carbon; TCNQ; Lithium-oxygen battery; Fast charge; CoS2; TCNQ; Nitrogen/sulfur dual-doped carbon; Electrocatalysts
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2021.129367

[Display omitted] •CoS2@NS-C cubes were synthesized using TCNQ coordination polymer and CoI2.•CoS2@NS-C cube is composed of N/S dual-doped carbon cube with embedded CoS2.•CoS2 nanoparticles (D ≈ 5 nm) are uniformly distributed in N/S dual-doped carbon sheath.•CoS2@NS-C cubes provide high electronic conductivity and ORR/OER activity.•CoS2@NS-C cubes are achieved to high-rate performance and quick-charging capability. Nitrogen/Sulfur dual-doped carbon cubes with built-in CoS2 nanoparticles (CoS2@NS-C cubes) as an electrocatalyst are developed to improve the high-rate and long-term performance of lithium-oxygen batteries. The CoS2@NS-C cubes were synthesized by coprecipitation between a cobalt salt and 7,7,8,8-tetracyanoquinodimethane (TCNQ) and subsequent thermal sulfidation. TCNQ acted as the coordination polymer for a cube shape and as the nitrogen source for nitrogen-dopants. The CoS2@NS-C cubes comprise uniformly distributed CoS2 nanoparticles in a nitrogen/sulfur dual-doped carbon matrix, providing fast catalytic activity for oxygen reduction/evolution reactions. The CoS2@NS-C cubes exhibited a high-rate performance of 5000 mA g−1 as well as long-term performance of > 100 cycles with a current density of 2000 mA g−1. These results confirmed the enhanced performance of the lithium-oxygen battery, with fast charging capability.